I am looking for a double potentiometer that failed on a Casio Privia PX-110. The markings show Alps UC 502b. I can't find the same part on the alps site. Size wize this one seems to be similar **broken link removed**l but I am not sure how to tell the rating off the old one to see if it matches. I have also seen some Chinese knock offs that seem similar but I want to be sure it will work. The casio part number seems to be 91087899223 but it is discontinued. How can I get the ratings for the 502b and find an equivalent replacement?